ABSTRACT
This linear strain makes the internal force vector lin ear with respect to nodal displacement vector. Namely it simplifies Equation (1) to the following linear system:
This allows a preprocessing step that computes the constant stiffness matrix K and its LU factorization. This preprocessing step has been the key factor to real time performance in previous works, such as [5], which animates deformations using a sequence of static equi libria.
